Identify a chemical reagent used in this experiment that can be used to distinguish solid CaCl2 (soluble) from solid CaCO3 (insoluble). What is the distinguishing observation?
Answer: Silver nitrate is the chemical reagent used to distinguish.
Explanation:
Dissolve both compounds in water. And add silver nitrate to that solution.
1. In case of calcium chloride
The calcium chloride is soluble in water and thus forms ions in aqueous solution.The chloride ions present in the solution react with silver ions of silver nitrate to give white color precipitate of silver chloride.
[tex]2AgNO_3+CaCl_2\rightarrow 2AgCl(white)+Ca(NO_3)_2[/tex]
2. in case of calcium carbonate.
The calcium carbonate is poorly soluble in water. Since, it doesn't get dissolved in water.
When silver nitrate is added there will be no formation of any precipitate.
What does erosion do?
(im really not good at science)
Which measurement uses SI units for mass?
A.43 kilograms
B.65 meters
C.38 pounds
D.89 seconds
It's a product formed from a burning candle are carbon carbon dioxide and water what elements were in the reactants
one agent of chemical weathering is _______________ which combines with water to form carbonic acid
The effect of gravity on matter is the measure of __?
Calculate the atomic mass in grams of 0.35 moles of CH4
Answer: 5.6 grams
Explanation:
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Thus mass =[tex]{\text {number of moles}}\times {\text {Molar mass}}[/tex]
For [tex]CH_4[/tex]
Moles of [tex]CH_4[/tex]= 0.35 moles
Molar mass of [tex]CH_4[/tex] = 16 g/mol
Putting values in above equation, we get:
mass =[tex]0.35moles\times 16g/mol=5.6 g[/tex]
The atomic mass of 0.35 moles of [tex]CH_4[/tex] is 5.6 grams.
Containers of ice cream are sold by volume, not by weight. Some ice cream manufacturers pump air into the ice cream before packaging it. Why does this practice make the ice cream more expensive to the consumer?
A) Air weighs more than ice cream does.
B) Air weighs less than ice cream does.
C) After air is pumped into ice cream, the mixture occupies a greater volume than the ice cream alone did.
D) After air is pumped into ice cream, the mixture occupies a smaller volume than the ice cream alone did.
Pumping air into ice cream increases its volume, making consumers pay more for a lower actual amount of ice cream by volume. This is why ice cream with added air is more expensive. The correct answer is option C) After air is pumped into ice cream, the mixture occupies a greater volume than the ice cream alone did.
Ice cream manufacturers often pump air into the ice cream before packaging it. This practice makes ice cream more expensive to the consumer because the resulting mixture occupies a greater volume than the ice cream alone did. Therefore, consumers are paying more for a lower actual amount of ice cream by volume.
Let's explore why this is the case:
Volume vs. Weight: Ice cream is sold by volume, and pumping air into it increases its volume. This means a container still measures the same volume of product, but it contains less actual ice cream.Density: When air is added, the density of the ice cream mixture decreases. This means there is more air and less ice cream in the same volume.Consumer Impact: Since consumers buy ice cream by volume, they end up paying more for less actual ice cream.Will an object of a density of 1.05 g/ml sink or float
Which statement best compares the properties of compounds and elements that the compounds contain?
A.They are always identical.
B.They are different.
C. They are similar.
D.They represent opposite characteristics.
what is the molar mass of H2SO4
Chopping wood is an example of a physical change. Burning wood logs in a fire is a chemical change.
What distinguishes the chemical change from the physical change?
A. The chemical change takes away weight.
B. The chemical change creates something new.
C. The chemical change makes the wood smaller.
D. The chemical change makes the wood change shape.
Scientists saw how well people responded to animals and imagined ___________ that these interactions might be helpful in some types of therapy?
For most of the last 50 years, technology knew its place. We all spent a lot of time with technology—we drove to work, flew on airplanes, used telephones and computers, and cooked with microwaves. But even five years ago, technology seemed external, a servant. These days, what’s so striking is not only technology’s ubiquity but also its intimacy.
On the Internet, people create imaginary identities in virtual worlds and spend hours playing out parallel lives. Children bond with artificial pets that ask for their care and affection. A new generation contemplates a life of wearable computing, finding it natural to think of their eyeglasses as screen monitors, their bodies as elements of cyborg selves. Filmmakers reflect our anxieties about these developments, present and imminent. In Wim Wenders’s Until the End of the World, human beings become addicted to a technology that shows video images of their dreams. In The Matrix, the Wachowski brothers paint a future in which people are plugged into a virtual reality game. In Steven Spielberg’s AI: Artificial Intelligence, a woman struggles with her feelings for David, a robot child who has been programmed to love her.
Today, we are not yet faced with humanoid robots that demand our affection or with parallel universes as developed as the Matrix. Yet we’re increasingly preoccupied with the virtual realities we now experience. People in chat rooms blur the boundaries between their on-line and off-line lives, and there is every indication that the future will include robots that seem to express feelings and moods. What will it mean to people when their primary daily companion is a robotic dog? Or to a hospital patient when her health care attendant is built in the form of a robot nurse? Both as consumers and as businesspeople, we need to take a closer look at the psychological effects of the technologies we’re using today and of the innovations just around the corner.
Indeed, the smartest people in the field of technology are already doing just that. MIT and Cal Tech, providers of much of the intellectual capital for today’s high-tech business, have been turning to research that examines what technology does to us as well as what it does for us. To probe these questions further, HBR senior editor Diane L. Coutu met with Sherry Turkle, the Abby Rockefeller Mauzé Professor in the Program in Science, Technology, and Society at MIT. Turkle is widely considered one of the most distinguished scholars in the area of how technology influences human identity.
Few people are as well qualified as Turkle to understand what happens when mind meets machine. Trained as a sociologist and psychologist, she has spent more than 20 years closely observing how people interact with and relate to computers and other high-tech products. The author of two groundbreaking books on people’s relationship to computers—The Second Self: Computers and the Human Spirit and Life on the Screen: Identity in the Age of the Internet—Turkle is currently working on the third book, with the working title Intimate Machines, in what she calls her “computational trilogy.” At her home in Boston, she spoke with Coutu about the psychological dynamics between people and technology in an age when technology is increasingly redefining what it means to be human.
You’re at the frontier of research being done on computers and their effects on society. What has changed in the past few decades?
To be in computing in 1980, you had to be a computer scientist. But if you’re an architect now, you’re in computing. Physicians are in computing. Businesspeople are certainly in computing. In a way, we’re all in computing; that’s just inevitable. And this means that the power of the computer—with its gifts of simulation and visualization—to change our habits of thought extends across the culture.
Answer:
Humanistic Theory.
Explanation:
Humanistic theory can be found to underpin aspects of developmental theories, such ... despair, as well as many therapeutic approaches that aim to explore and respect the ... Humanistic theories are useful to social work practice as they provide a client and animal, or stating the metaphors that arise in those interaction
A rock has a mass of 210 grams and occupies a volume of 70 cm3. What is its density?
compute 214.056 + 9.3456. Round the answer appropriately
Final answer:
The sum of 214.056 and 9.3456 is 223.4016.
Explanation:
The sum of 214.056 and 9.3456 is 223.4016. Rounding this answer to an appropriate number of decimal places depends on the desired level of precision. If we want the answer rounded to two decimal places, we would round it to 223.40. However, if we want the answer rounded to the nearest whole number, we would round it to 223.
How many kilograms of the rock must be processed to obtain 2.0 kg of Pb ?
Which is NOT unique to each element?
A. proton number
B. atomic number
C. neutron number
D. chemical symbol
Final answer:
The neutron number is not unique to each element.
Explanation:
The correct option is C. neutron number.
While proton number (also known as atomic number) and atomic number are unique to each element, representing the number of protons in the nucleus of an atom, the neutron number can vary for different isotopes of the same element.
The chemical symbol is also unique to each element, representing an abbreviation used to identify the element or its atoms. Each element on the periodic table is assigned a unique chemical symbol.
The correct answer is C. Neutron number is NOT unique to each element.
Each element in the periodic table is defined by its atomic number, which is the number of protons in the nucleus of an atom of that element. The atomic number is unique to each element and determines its position in the periodic table. For example, hydrogen has an atomic number of 1, meaning it has one proton in its nucleus, and helium has an atomic number of 2, meaning it has two protons.
The proton number, which is another term for the atomic number, is also unique to each element. Therefore, options A and B (proton number and atomic number) are unique to each element.
On the other hand, the neutron number is not unique to each element. Different isotopes of the same element have different numbers of neutrons. For instance, the most common isotope of carbon is carbon-12, which has 6 neutrons, but there is also a carbon-13 isotope, which has 7 neutrons, and a carbon-14 isotope, which has 8 neutrons. All these isotopes are still carbon because they have the same atomic number (6 protons), but they have different neutron numbers.
The chemical symbol is a shorthand way to represent an element and is also unique to each element. For example, the chemical symbol for carbon is C, for oxygen is O, and for hydrogen is H. These symbols do not change regardless of the isotope or the number of neutrons present in the nucleus.
What is the volume, in milliliters, of 6.60 g of acetone?
The volume, in milliliters, of 6.60 g of acetone is 8.40 ml.
What is measurement?Distance is a physical quantity which is measured in meter. If a man travel then it is measured in meters that defines that how much he travel from one point to another point for all these type of things we use to measure distance.
Centimeter is also a physical quantity which is use to measure distance. 1 centimeter is equal to 0.01 meter and 1 centimeter is equal to 0.00001 kilometer.the kilometer is large quantity to measure distance while centimeter is smaller quantity to measure distance.
Kilometer is also a physical quantity which use to measure the distance 1 kilometer is equal to 1000 mtr and 1 kilometer is equal to 100000 centimeter.
For above conclusion, we easily states that the kilometer is large quantity to measure distance while centimeter is smaller quantity to measure distance. Centimeter is also a physical quantity which is use to measure distance. 1 centimeter is equal to 0.01 meter and 1 centimeter is equal to 0.00001 kilometer.
Therefore, The volume, in milliliters, of 6.60 g of acetone is 8.40 ml.
Leran more about measurement here:
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Vanessa jogged 8 miles in 2 hours. What was her average speed?
2 miles per hour
8 miles per hour
16 miles per hour
4 miles per hour
[tex]\text{Hey there!}[/tex]
[tex]\text{Vanessa jogged 8 miles in 2 hours. What was her average speed?}[/tex]
[tex]\text{First,, highlight/ underline your key-terms. Then solve it from there!}[/tex]
[tex]\text{Key term 1: \underline{8 miles}}\\\text{Key term 2: \underline{ in 2 hours}}[/tex]
[tex]\text{Now we have to find her average speed. }[/tex]
[tex]\text{Formula: }\dfrac{\text{a}}{\text{b}}[/tex]
[tex]\text{a = 8}\\\text{b = 2}[/tex]
[tex]\dfrac{8}{2}= \text{the answer}\\\\\dfrac{8\div2}{2\div2}=\dfrac{4}{1}= 4\\\\\\\boxed{\boxed{\bf{Answer: 4}}}\checkmark[/tex]
[tex]\text{Good luck on your assignment and enjoy your day!}\\\\\frak{LoveYourselfFirst:)}[/tex]
Why do scientists consider ice a mineral?
a drop of gasoline has a mass of 22 mg and a density of 0.754 g/cm^3. What is its volume in cubic centimeters?
The valence electrons of an atom of which element would feel a smaller effective nuclear charge than the valence electrons of a calcium (Ca) atom?
Final answer:
Potassium (K) is an example of an element whose valence electrons feel a smaller effective nuclear charge than the valence electrons of a calcium (Ca) atom due to potassium's lower number of protons in the nucleus and similar shielding effect.
Explanation:
The concept of effective nuclear charge (Zeff) is important to understand why valence electrons in some elements feel a weaker nuclear pull compared to calcium (Ca). Effective nuclear charge essentially means the net positive charge experienced by valence electrons, after accounting for the shielding effect of the inner electrons. Calcium is a Group 2 element with a 4s2 valence electron configuration. A good example of an element whose valence electrons would feel a smaller effective nuclear charge than those of calcium would be potassium (K).
Potassium, being in the same period but belonging to Group 1, has one valence electron in its 4s orbital. Due to the lower nuclear charge (less protons in the nucleus) and similar shielding by inner electrons, potassium's single valence electron feels less pull from its nucleus compared to a calcium's two valence electrons. Moreover, when potassium forms a cation by losing its valence electron, the remaining electrons are still shielded by the same number of inner electrons, but now there is one less proton in the nucleus to exert a pull. Consequently, the valence electron in a potassium atom would experience a lower effective nuclear charge compared to the valence electrons in a calcium atom.
what did the professer use a catalyst for the flubber experiment
Final answer:
A catalyst is used to speed up the flubber experiment. Borax is a possible catalyst that can accelerate the formation of flubber by lowering the activation energy and promoting the reaction between polyvinyl acetate glue and borax.
Explanation:
A catalyst is a substance that speeds up a chemical reaction without being consumed in the process. In the flubber experiment, the professor most likely used a catalyst to accelerate the formation of flubber. One possible catalyst that could be used in this experiment is sodium borate, also known as borax.
The reaction between polyvinyl acetate glue and borax in the presence of water leads to the formation of cross-linked polymer chains, creating the bouncy and stretchy substance known as flubber. The borax acts as a catalyst by lowering the activation energy of the reaction, allowing it to occur more quickly.
By using a catalyst, the professor was able to demonstrate the reaction between the glue and borax more efficiently, saving time and ensuring a successful flubber formation.
science question down below
What is the density (in g/L) of a gas with a molar mass of 70.49g/mol at 0.874atm and 389K?
Explanation:
According to the ideal gas law, PV = nRT
where, n = number of moles
Also, density = [tex]\frac{mass}{volume}[/tex]
Since, n = [tex]\frac{mass}{\molar mass}[/tex]
Therefore, ideal gas equation can also be written as follows.
PV = nRT
PV = [tex]\frac{mass}{\text{molar mass}} \times RT[/tex]
[tex]P \times \text{molar mass}[/tex] = dRT
Hence, putting the given values into the above formula as follows.
[tex]0.874 atm \times 70.49 g/mol = d \times 0.0821 Latm/mol K \times 389 K[/tex]
6.161 atm g/mol = [tex]d \times 31.94 Latm/mol[/tex]
d = 0.193 g/L
Thus, we can conclude that density of the given gas is 0.193 g/L.
The density of a gas with a molar mass of 70.49 g/mol at 0.874 atm and 389 K is calculated using the Ideal Gas Law and is approximately 1.928 g/L.
To calculate the density of a gas with a molar mass of 70.49 g/mol at 0.874 atm and 389 K, we can use the Ideal Gas Law, which states PV = nRT. Here, density (d) is equivalent to the mass (m) of the gas divided by its volume (V), and the number of moles (n) can be found by dividing the mass (m) by the molar mass (M). We then rearrange the Ideal Gas Law to solve for n/V, which gives us the formula for density (d = PM/RT).
Using the provided gas conditions and the Ideal Gas constant (R = 0.0821 L·atm/mol·K), we can perform the following calculation:
First, convert the pressure from atm to the unit matching the gas constant: P = 0.874 atm.
Now, insert all values into the density formula: d = (P × M) / (R × T) = (0.874 atm × 70.49 g/mol) / (0.0821 L·atm/mol·K × 389 K).
Perform the multiplication and division to find the density: d ≈ (61.60826 g·atm/mol·K) / (31.9589 L·atm/mol·K) ≈ 1.928 g/L.
470,809 mi express in an integer
Answer: The given number is already an integer.
Explanation:
Integer is defined as a whole number which is not a fraction. This number can be positive, negative or zero.
Decimal numbers are not considered as integers. They are rounded off to write an integer.
For Example: 4, -2 and 0, all are considered as integers.
We are given a number having value 470,809 miles. The number is already a whole positive number.
Thus, the given number is already an integer.
Why is understanding the different states of matter useful and important? Please explain.
what is the eccentricity of mars
what energy conversion occurs when a sling shot is used to shoot a rock across the room
Radioactivity is the process of nuclear decay.
True or False
Radioactivity is indeed the process of nuclear decay, involving unstable atomic nuclei losing energy by emitting particles or electromagnetic waves.
The statement that radioactivity is the process of nuclear decay is True. Radioactivity involves unstable atomic nuclei that spontaneously lose energy by emitting particles or electromagnetic waves, a process known as radioactive decay. These emissions result in the transformation of the parent nuclide into a different atom, called the daughter nuclide. It's a quantum mechanical process and cannot be predicted exactly for individual nuclei, though probabilities of decay over time can be estimated.